This easy 4-ingredient French Onion Chicken Casserole delivers all the cozy, bistro-style flavor of classic French onion soup — without hours of caramelizing onions. Tender baked chicken meets a rich, savory sauce made from condensed soups, finished with gooey, golden cheese. It’s the perfect weeknight comfort food that feels luxurious but takes minimal effort.

Pair it with simple, fresh sides to balance its richness: a crisp green salad, buttery mashed potatoes, or roasted green beans all work beautifully. And of course, a slice of crusty bread is ideal for soaking up the oniony sauce.

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• Why You’ll Love This Recipe
• What You’ll Need
• How to Make It
• Variations & Tips
• Recipe Card

Why You’ll Love This Recipe

• Only 4 ingredients — minimal shopping, big flavor.
• One-pan convenience: everything bakes together in one dish.
• Rich and comforting: creamy sauce with melted cheese on top.
• Versatile: works with chicken breasts or thighs.
• Freezer-friendly: easy to make ahead for busy nights.

What You’ll Need

See the recipe card below for exact measurements.

• Boneless, skinless chicken breasts or thighs
• Condensed cream of chicken soup
• Condensed French onion soup
• Shredded Swiss or Gruyère cheese

How to Make It

1. Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch casserole dish.
2. Arrange chicken in a single layer in the dish.
3. In a bowl, whisk together both soups (no water needed) until smooth.
4. Pour the mixture over the chicken, coating evenly.
5. Cover with foil and bake 25–30 minutes, until chicken reaches 165°F (74°C).
6. Uncover, sprinkle with cheese, and bake 10–15 more minutes until melted and bubbly.
7. Let rest 5–10 minutes before serving for the sauce to thicken.

Variations & Tips

• French onion flair: Add croutons or crushed toasted baguette slices before the final bake for texture.
• Boost flavor: Stir in 1 tsp Dijon mustard or a splash of dry white wine into the soup mixture.
• Cheese options: Mix Swiss with mozzarella for extra meltiness.
• Add veggies: Layer in thinly sliced onions or mushrooms before adding the soup mixture.
• Make ahead: Prepare and freeze before adding cheese; thaw and bake when ready.

4-Ingredient French Onion Chicken Casserole

Prep Time: 10 minutes  |  Cook Time: 40–45 minutes  |  Total Time: 55 minutes  |  Servings: 4

Ingredients

• 1.5 to 2 lbs boneless, skinless chicken breasts or thighs
• 1 (10.5 oz) can condensed cream of chicken soup
• 1 (10.5 oz) can condensed French onion soup
• 1 1/2 cups shredded Swiss or Gruyère cheese (about 6 oz)

Instructions

1. Preheat oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish.
2. Pat chicken dry and arrange in a single layer.
3. Whisk together the soups and pour over the chicken, coating evenly.
4. Cover tightly with foil and bake for 25–30 minutes, or until chicken reaches 165°F.
5. Remove foil, sprinkle cheese on top, and bake uncovered for 10–15 more minutes until bubbly and golden.
6. Let rest for 5–10 minutes before serving. Spoon sauce over each piece of chicken.

Serving Ideas

• Serve with mashed potatoes, buttered noodles, or rice.
• Add a crisp salad or roasted vegetables for a balanced meal.
• Enjoy with crusty bread to soak up the rich sauce.